Dorothy, who lives in Ingleby Care Home, Ingleby Barwick , got up and performed the impromptu duet.

The video has since been watched 14,000 times.

Her daughter, Geraldine, said: “She doesn’t know who we are, but she knows the words to Christmas songs!

“I’m really surprised at how many ‘likes’ it got. Her mother was a singer, but not professional or anything.

“My mother has always loved musicals and singing. She’s never done anything like this before.

“It’s just hilarious, so funny. I had no idea it would move so many people. She just loves music.”

Dorothy Hatfield (Image: Evening Gazette)

Originally from Middlesbrough , Dorothy has three children, Geraldine, Beverly and Peter. She moved to Yarm when her children were little, but had to go into the care home when her husband, Albert, passed away last year.